Achtung! Cthulhu CoC in WWII era (has rules for Savage Worlds as well, and conversions for FATE and Trail of Cthulhu)

World War Cthulhu CoC in WWII and Cold War eras

Cthulhu Now CoC in modern times (1990s)

Delta Green CoC meets X-Files, in the 1990s

The Laundry CoC meets the MI6, in the 2000s (based on the Laundry book series)

Dreamlands expansion of CoC dealing with the Dreamlands

Cathulhu CoC with cat PCs

Other Mythos Games
These are non-BRP games heavily featuring the Cthulhu Mythos. Mostly, these are either conversions of CoC to some other game system, or hybrid games merging the Cthulhu Mythos with another major theme (and often using a rules system suitable for that theme).

D20 Call of Cthulhu D20 version of CoC

Trail of Cthulhu GUMSHOE version of CoC, set in the 1930s, or in the Gaslight era

Cthonian Stars Traveller, set in the near future (The Void is a remake of the same setting with a new custom system)

GURPS Cthulhupunk GURPS, set in the near future (cyberpunk-themed)

Alba di Cthulhu (a dedicated card based system; the game is set in a post-apocalyptic world after the rise of R'lyeh)

Clockwork & Cthulhu Clockwork & Chivalry

Dark Streets OpenQuest / D100 system

Other Games featuring Mythos elements
These are settings and supplements which include elements of the Cthulhu Mythos into an existing game. The list is definitely not meant to be exhaustive, listing only major supplements/settings.

Deities & Demigods AD&D book with stats for the Cthulhu Mythos entities (later reprinted as Legends and Lore without the Mythos content).

Strange Aeons is an adventure path for Pathfinder which includes Mythos elements such as the Yellow Sign and the Great Old Ones. References to Cthulhu Mythos are also found in several Pathfinder bestiaries and modules.

Sandy Petersen's Cthulhu Mythos for Pathfinder is an upcoming bestiary for Pathfinder by Call of Cthulhu's author.

Primeval Thule is a campaign setting set inspired by the works of R. E. Howard, H. P. Lovecraft and C. A. Smith, which includes Mythos cults and monsters within a Conan-like setting.

Last Edit: Fix on Deities & Demigods.

Last edited by agathokles on Sun Jul 29, 2018 9:24 am, edited 27 times in total.

It’s probably not necessary to include every Lovecraft reference in every RPG, however, the Cthulhu Mythos section in the AD&D Deities & Demigods book is legendary. The second printing of the book included this statement on page 4: “Special thanks are also given to Chaosium, Inc. for permission to use the material found in the Cthulhu Mythos and the Melnibonean Mythos.” In other words, this was even an official, licensed thing at that point. (In return, official D&D and AD&D stats were included in Chaosium’s Thieves World box.)

Under the BRP list I would include Dreamlands.

1920s Britain: Not sure how much this counts as a variant—maybe you would call it a setting or maybe you would just say sourcebooks on a common theme—but there’s so much now that it perhaps deserves a mention. In 1987, Games Workshop published Green and Pleasant Land. In 1996, Chaosium published The London Guidebook. In 2009, Cubicle 7 published Cthulhu Britannica. Since then, they have published 5 supplements for this line, including the massive Cthulhu Britannica London Box Set in 2015. So, again, maybe this wouldn’t be added to the OP list, but I thought I would note it in the thread!

Indeed, I didn't add merely geographic supplements -- like London Guidebook, Cairo Guidebook, etc for CoC or Dreamhounds of Paris for ToC. Otherwise, the list will rapidly escalate to a list of all Cthulhu-themed RPG books.

I've added Silent Legions to the list of non-BRP games. This one is based on the system used first in Stars Without Number, an old-school sandbox game that spawned a slew of successors. Silent Legions is the author's take on Lovecraftian horror, combined with the sandbox/random generation style of Stars Without Number. The rules combine a simple skill-based system (2d6+bonuses vs target number) with classic D&D-style character classes.

I've added Alba di Cthulhu ("Dawn of Cthulhu"), a new Italian game from the authors of Sine Requie. It uses its own rules system, with cards (a standard poker deck) for randomness, and is set in 1937, but in a variant timeline where Cthulhu has finally awaken, humanity has been mostly destroyed, and the various Mythos races operate openly. Contrary to most Mythos games, this one only leverages Lovecraft works, not the wider Mythos, and it is not designed in the horror genre, but rather in a pulp/urban fantasy style.

Angel Tarragon wrote:In the first post in the 'Other Games featuring Mythos elements' the Paizo Publishing Pathfinder RPS world of Golarion should be included.

Strange Aeons Adventure Path is but one of many Pathfinder products that steep the setting in the mythos.

Can you point out other Pathfinder/Golarion books/APs that are Mythos related? Pathfinder is a huge product line, mentioning it in general does not seem to me a good idea, since most of it is not Mythos-specific.

The only element I might add would be Bestiary 2, 4 and 5 (as they have some mythos creatures or Elder Gods) and Serpentfolk or Serpentfolk element came up in a couple modules and PFS scenario and 1 novel but's all I can think is missing.

On another note, in addition to my earlier post, Convict & Cthulhu is another fun little setting. It uses CoC 7th ed mechanic, but it is set in Australia 1795-1810 era. And they even have 4 small supplements/adventure hooks offered.

Frog God's Game has for one of his God: Tsathogga the Demon Frog- God (really an thinly veiled Homage to C.A. Smith Tsathoggua)

It's not out yet, but Ember Design Studio recently had a Kickstarter for an adventure (WOIN, D&D 5th and PFRPG) inspired by H.P. Lovecraft stories in particular The Case of Charles Dexter Ward, The Shadow Over Innsmouth, and At the Mountains of Madness.

Thanks, added Convict & Cthulhu and a note regarding Pathfinder bestiaries -- I'm not going to mention them individually unless there's a relatively large coverage in a single book rather than individual entities, as the "Other Games" section is not supposed to be exhaustive, rather to give a nod to well-known games that can be used with the Mythos.